<%--
  Created by IntelliJ IDEA.
  User: notyoukennk
  Date: 2022/11/6
  Time: 12:30
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="utf-8"%>
<%@ page import="java.io.OutputStream" %>
<%!
    Color getRandColor(int fc,int bc)
    {
        Random random = new Random();
        if(fc>255) fc=255;
        if(bc>255) bc=255;
        int r=fc+random.nextInt(bc-fc);
        int g=fc+random.nextInt(bc-fc);
        int b=fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
    }
%>
<%
    try{
    /*这句针对resin服务器，如果是tomacat可以不要这句*/
    response.setHeader("Pragma","No-cache");//
    response.setHeader("Cache-Control","no-cache");//
    response.setDateHeader("Expires", 0);//设置不要缓存页面
    int width=60, height=20;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

    OutputStream os=response.getOutputStream();
    Graphics g = image.getGraphics();
    Random random = new Random();
    g.setColor(getRandColor(200,250));
    g.fillRect(0, 0, width, height);
    g.setFont(new Font("Times New Roman",Font.PLAIN,18));
    g.setColor(getRandColor(160,200));
    for (int i=0;i<155;i++)
    {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(12);
        int yl = random.nextInt(12);
        g.drawLine(x,y,x+xl,y+yl);
    }
    String sRand="";
    for (int i=0;i<4;i++){
        String rand=String.valueOf(random.nextInt(10));
        sRand+=rand;
        g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
        g.drawString(rand,13*i+6,16);
    }
// 将认证码存入SESSION
    session.setAttribute("sRand",sRand);
    g.dispose();
    ImageIO.write(image, "JPEG", response.getOutputStream());

    os.flush();
    os.close();
    os=null;
    response.flushBuffer();
    out.clear();
    out = pageContext.pushBody();
    }
    catch(IllegalStateException e)
    {
    System.out.println(e.getMessage());
    e.printStackTrace();
    }
%>
